A 250 ML Sample of 0

Multiple Choice

A 25.0 mL sample of 0.723 M HClO₄ is titrated with a 0.273 M KOH solution. The H₃O⁺ concentration after the addition of 66.2 mL of KOH is M.

A) 0.439
B) 2.81 × 10^{- 13}
C) 0.273
D) 0.723
E) 1.00 × 10^{- 7}